The day in numbers: $6.5 billion

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$6.5 billion: The amount wiped off the value of online gambling shares on Monday after the U.S. Congress passed legislation to ban Internet gaming there.

$12 billion: The estimated worldwide revenue from gambling online in 2005, according to a recent report by industry analysts Christiansen Capital Advisors. They also predicted the market will double in five years.

78: The percentage of revenue earned by UK-based gambling firm PartyGaming Plc, which runs the leading Internet poker site PartyPoker.com, currently generated from the U.S.

19 million: The number of customers who use PartyGaming, spending nearly $4 million a day. Shares in the company fell 58 percent Monday.

$3.2bn: The estimated wealth of PartyGaming founder Anurag Dikshit, according to the Sunday Times Rich List.

1,700: The estimated number of gambling Web sites.

2.3: The percentage of people estimated to suffer from gambling addiction in Australia -- the highest figure in the world.